Includes your choice of aluminum or copper heat sink with set screw and a 0.050' Allen wrench (or no heat sink), choice of standard aluminum, drilled aluminum, drilled brass or heat sink driver pill, all including a brass ring to fit a 16.8mm diameter driver board, choice of black anodized finish with no marking or black anodized finish with the Survival Laser logo and choice of holster or no holster.Note: If you select the "driver heat sink" pill option, you should also select the "extended and tapered copper" heat sink option to allow enough room for the other components.

All heat sinks are designed to fit a standard 12mm diameter diode module.

The S4 host can be used as a high performance flashlight with our flashlight parts bundles and a single 18650 battery.

The S4 host is compatible with the battery extension tube, pressure pad switch, the Survival Laser holster and other parts and accessories.